/Engine/Plugins/Developer/Concert/ConcertMain/Source/Concert/Public/IConcertServerEventSink.h
As opposed to archiving a session, once exported, the session is not tracked anymore by the server and the exported files can be copied/modified while the server is running.
bool ExportSession ( const [IConcertServer](API\Plugins\ConcertServer\IConcertServer) & InServer, const [FGuid](API\Runtime\Core\Misc\FGuid) & InSessionId, const [FString](API\Runtime\Core\Containers\FString) & DestDir, const [FConcertSessionFilter](API\Plugins\Concert\FConcertSessionFilter) & InSessionFilter, bool bAnonymizeData )